[i737c] Base fit examples on Datafield (except last 2) ()

Device/Data/Datafield.cpp

Device/Data/Datafield.h

Wrap/Python/ba_fitmonitor.py

auto/Examples/bayesian/likelihood_sampling.py

auto/Examples/fit/scatter2d/consecutive_fitting.py

auto/Examples/fit/scatter2d/custom_objective_function.py

auto/Examples/fit/scatter2d/expfit_galaxi.py

auto/Examples/fit/scatter2d/find_background.py

auto/Examples/fit/scatter2d/fit2d.py

auto/Examples/fit/scatter2d/fit_along_slices.py

auto/Examples/fit/scatter2d/fit_gisas.py

auto/Examples/fit/scatter2d/fit_with_masks.py

auto/Examples/fit/scatter2d/lmfit_basics.py

auto/Examples/fit/scatter2d/lmfit_with_plotting.py

auto/Examples/fit/scatter2d/minimizer_settings.py

auto/Examples/fit/scatter2d/model1_cylinders.py

auto/Examples/fit/scatter2d/model2_hexlattice.py

auto/Examples/fit/scatter2d/multiple_datasets.py

auto/Examples/fit/specular/Honeycomb_fit.py

auto/Examples/fit/specular/PolarizedSpinAsymmetry.py